11661680 has 20 divisors (see below), whose sum is σ = 27113592. Its totient is φ = 4664640.

The previous prime is 11661659. The next prime is 11661691. The reversal of 11661680 is 8616611.

11661680 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72806 + ... + 72965.

Almost surely, 2^11661680 is an apocalyptic number.

11661680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

11661680 is an abundant number, since it is smaller than the sum of its proper divisors (15451912).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

11661680 is a wasteful number, since it uses less digits than its factorization.

11661680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145784 (or 145778 counting only the distinct ones).

The product of its (nonzero) digits is 1728, while the sum is 29.

The square root of 11661680 is about 3414.9202040458. The cubic root of 11661680 is about 226.7707518892.

The spelling of 11661680 in words is "eleven million, six hundred sixty-one thousand, six hundred eighty".